What produces more severe burns,boiling water or steam?

Give reasons: We can easily move our hand in air but to do the same through a solid block of wood,we need a karate expert.

Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Give two reasons to justify:
$(a)$ Water at room temperature is a liquid.
$(b)$ An iron almirah is a solid at room temperature.

The mass per unit volume of a substance is called density $(density = mass/volume)$. Arrange the following in order of increasing density: air, exhaust from chimneys, honey, water, chalk, cotton, and iron.

Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away,but to get the smell from cold food you have to go close.